Help me find a manhwa pls

Heyy anybody knows of a manhwa with a hero system where the protagonist is a teen leveled as E or F, while his father is an S or something like that.. the protagonist keeps on training even though hes not strong magic-wise and he has a small sister that was in a coma or something like that, and she returned from the fairyland with extraordinary powers that only he can suppress... They are chosen to go to some school together we're all the students have different kinds of power and are ranked on different levels and people don't like them cause they don't show their talents.. they were also on a cruise ship that took them to that school that is secluded in so island I think.. Please help me find it 🙏🏽